Tire-inflating mechanism



S'pt. 21 1926.

W. G. CUMMING TIRE INFLATING MECHANISM Filed August 24, 1925 2 Sheets-Shae l ATTORNE Sept. 21 1926. 1,600,934

w. G. CUMMING I TIRE INFLATING MECHANISM Filed August -24. 1925 2 sheetg t 2 IINVENTOR.

WILI :nM CoRno-N Cumming,

/) TTURNEY.

, described.

Patented Sept. 121, 1926.

wJLLIA Gannon GUM-MING, or

MONTREAL, enmsne, cAENADA- A TIBE-INFLATING MECHANISM.

Application filed August 124, 1925. serial No. 52ml.

invention relates to the inflation of pneumatic tires and more particularly to" In my application Serial Number 752,749

one term of a suction pump is shown and .Thej impnovecl .tEo-rm -w-hioh is described hereafter consists of a pump entirely of resilient material such as rubber and is of a greatly improved design with many .advantage r r a Bylfilzim'm-ating metal toggles and changthe position and form-oi the valves a simpler, cheaper and more efiicient pump is"provided, and any damageto a collapsed tineisobyiated. Y g V f It consists briefly ,of asuction pump of resilient material situated within the inflated-tube, which produces a vacuum when operated by the pressureo-f the tread of the tire, draws air into the pump, and when the ipfiggurglof tread is removed, forces t f the pump into the surro hd g .tuhe. p

Flt is dj t d that it only operates -w-hen the air -pnessure within the tube falls r elow ..,e .normahpnessurerequired, or in theeyent of overload.

-invent ion is of simple and cheap con- .stnuction and is mounted on an inlet tuhe passing thitoug gh wheel rim.

By means of adjusting the position of the pump in ,r elation to .the tread, it will only 7 function when ,theinflationof the tube falls I 41., threaded at .42., to mesh below the designed degree for normal open a tion. Not only' will it maintain ,a ,tube fully infiatedto the desired pressure under ordinary conditions but in the case of small or a slow leak it .Will keep the time .in an effective condition and prevent its collapse and injury which might result; v p

" l Y Whichxmayhe 'iuteg a ithereirom. r Befe'reilice' is made to the accompanying i drawings 'in whioh F g. lie a side new 43f the pump.

slits are 6 C the casih.

an in eif ior .anh lla r ng {22 tip 4-1, is mounted. The end of tube 41,, is notch at $6, t en bl -th e gui'np body 1.

Fig. 2 isa horizontal cross section on the line 2-2 of Fig. 1;

TENT OFFICE.

Fig. 3 is a vertical cross section on the Fig. tis a Vertical cross sectionon the" 7 Pu p:

to that of Fig. 2 but showing the effect Fig. 8 shows a sectional View of the inner tube, casing and pump under compression.

the form described hereafter.

p The pump consists of a spherical shaped i Ye l axi W u p The walls 20,01 the slits 2, are comparatively thin and i are preferably made with a having slits radiating from layer'of woven fabric while the edges of the 'a ed'ih rings 11; which id n to un te and the top and b tt mi- The bottom is h ped to. f m as 2; m e formed by h Sides o cover 7 An axial aprtlll 3, runsthro h the top ifrom the slits An' inletvai ve aperture +0, Pas es th iq l h the bottom portion axially, and a oup 50;

section shown in F gs. 2 nd J6- torn; substantial cushions 14, at

to fit on the end 5 f'the inl tu e, st m r 5, ex nds into the ba e The inletstem 5, is threadedegiterna lly and; intern lly at 1., a 0. 1

V The inle valve 4., mass f a me a ub ilh fld' hg f the stern ectih leeve 418,01 which the ubb r .v'jag v the a v e; .to he :femo e by -me n's s re riv The .end o he .ihil stem 5.1m-

.hfiith Th thnnblej fits "into the cup 150, and

inlet esive passes an" and, and has Wi h th' 'i te ie 5' an ha apre the Va a thi mih' threaded to aperture 80, in the inner tube 8, and the usual valve pad 81, surrounds the aperture 80. v

' A nut 54, and a washer 55, seal the aperture 80, in the inner tube 8. The inlet stem then passes through the rim 7, of the wheel.

A series of perforations of the cap 57, allows the air to enter the 7 cap 57.

'The filter 6, be secured within the inlet valve stem 5,:1n place of the arrange ment described.

Inorder to vary the position of the pump, shims 58, may be interposed between the nut 5A, and the rim 7 surrounding the stem 5. The operation of the device is as follows When the pump 1, is firmly mounted on the stem as shownin Fig. 7 the top 14, sur

" lby is pressed against the top aperture 3, and

rounding the aperture 3, is normally some distance from the inner tube 8..

, As the pump is not intended to inflate-f an empty tube but rather to maintain its inflation, the tube should be pumped up in the usual way through the inlet tube5.

, When the casing 9, is'flattened sulficiently the weight of the car, the inner tube 8, of the pump and the inner tube acts as a valve and closes the as long as compression lasts the air is prevented from passing out of the pump through the aperture 3. But as soon as the pressure is withdrawn the inner tube leaves the top of .the pump, and the outlet 3, isfree and open. I

The effect of further pressure on the top of the pump is to extend outwardly the middle section shown in Fig. 2, causing the walls or the slits to separate and assume a shape shown in Fig. 6, and creating a vacuum within'the pump. 7

Thelfiltered air is drawn in through the i stem and inlet valve and fills this area. This solid nature of the rubber top and bottom air is driven out of p the pump through the inlet 3, as soon as the inner tube ceases to block the passage, by reason of the return of. the displaced walls to their normal position.

Z Owing to the design of the pump and the comeback takes place with great force and rapidity. i i a p e The displaced walls are also driven back to their: normal closed postion by the air pressure within the inner tube, upon them.

: adapted By means of the fabric in the walls, movement is due to the stretching outwardly of the central portion of the rings and the displacement of the walls and not to stretching of the walls themselves.

. As the depression of the tread operate the pump. once on each can only mittent. As soon as the pump has raised the pressure in the tube to the normal degree required for proper operation, it will cease their revolution of 7 the wheel, the action of the pump is 1nterto function as the depression of the tread the tube flattening of the tube and be supported therewith. I

The sizes of the pump will be designed to correspond to the standard tire sizes," and the adjustment arranged 'to maintain the pressure suitable for the type of tire.

What I claim is a 1. In a device of the class specifiedthe combination of a wheel rim with a pneumatic tire thereon with a pump of resilient. ma-

terial within the inflatable tube of the tire adapted to be expanded and to form a vacuum within itself by the flattening of the tread of the tire, a valved inlet stem passing through the rim to the vinterior of the pump and supporting the pump, and a valved outlet from the pump to the surrounding interior of the inflatable tube of the'ti're.

2. In a device of the class specified the combination of a wheel rim and a pneumatic tire thereon with a pump of resilient material within the inflatable tube of the tire to be expanded and to form a vacu um within itself by the flattening of the tread of the tire, comprising a rubber body having slits radiating from an axis radial to the wheel, having portions of the rubber between the walls of the. slits cut away, a valved inlet stem passing through the rim the pump,

the class specified the llO combination of a wheel rim, a pneumatic t1re thereon, and an inlet tube passing through the rim and the inner tube, with a pump ofresilient material mounted on the end of the inlet tube and within the inner tube, adapted to be expanded and form a vacuum within. itself and to inflate the inner tube by the flattening of the tire tread.

A. In a pneumatic tire suction pump 11 s to the interior of the pump andsupporting l.

and an outlet from the pump to x the interior of the inflatable tube of the tire adapted to be inserted Within the inflatable adapted to be inserted within the-inflatable tube of spherical shaped form of resilient material having internal slits radiating from an axis and having fabric material'in the walls of the slits, with a valved inlet passage to the; slits at the supporting end of the axis and an outlet passage from the slits at the free end of the axis adapted to be closed by contact with the inner tube.

6. In a pneumatic tire a suction pump adapted to be inserted Within the inflatable tube of spherical shaped form of resilient material, having internal slits radiating from an axis and having the material between the walls covering the slits cutaway outlet passages.

in the middle, such cut portions diminishing towards the poles of the sphere, with a valved inlet passage to the slits at the supporting end of the axis and an outlet passage from the slits at the free .end of the axis adapted to be closed by contact with the inner tube.

T. A pump of resilient material adapted to be inserted within an inflatable tube comprising a spherical. body with slits radiating from the axis, having thin walls to the slits, and solid polar parts which are axially perforated to provide valved inlet and 8. A pump of resilient-material adapted to be inserted within an inflatable tube comprising a spherical shaped body, an axial valved inlet thereto, a series of slits ra'diat ing from the axis, having thin walls and solid edges which thicken towards the poles and an axial outlet adapted to be contact with the tube.-

WILLIAM GORDON CUMMING.

closed by 

